ethdb: pebble backend (64bit platforms only) (#26517)

* ethdb: use pebble

Co-authored-by: Gary Rong <garyrong0905@gmail.com>

foo

update

* apply suggested changes

* flags: go format

node: fix ddir lookup mistake

accounts/abi/bind: fix go.mod replacement for generated binding

deps: update pebble + with fix 32-bit build

* ethdb/pebble: respect max memtable size

* core/rawdb, ethdb: enable pebble on non-32bit platforms only

* core/rawdb: fix build tags, fix some review concerns

* core/rawdb: refactor methods for database opening

* core/rawdb: remove erroneous build tag

* cmd/geth: fix the flag default handling + testcase

* cmd/geth: improve testing regarding custom backends

* ethdb/pebble, deps: update pebble dependency

* core/rawdb: replace method with Open

* ethdb/pebble: several updates for pebble (#49)

* ethdb/pebble: fix size count in batch

* ethdb/pebble: disable seek compaction

* ethdb/pebble: more fixes

* ethdb, core, cmd: polish and fixes (#50)

* cmd/utils, core/rawdb, ethdb/pebble: address some review concerns

* Update flags.go

* ethdb/pebble: minor refactors

* ethdb/pebble: avoid copy on batch replay

* ethdb: fix compilation flaw

* cmd: fix test fail due to mismatching error message

* cmd/geth, node: rename backingdb to db.engine

---------

Co-authored-by: Jared Wasinger <j-wasinger@hotmail.com>
Co-authored-by: rjl493456442 <garyrong0905@gmail.com>
Co-authored-by: Péter Szilágyi <peterke@gmail.com>

cmd/utils/flags.go

@@ -99,6 +99,12 @@ var (
 		Usage:    "URL for remote database",
 		Category: flags.LoggingCategory,
 	}
+	DBEngineFlag = &cli.StringFlag{
+		Name:     "db.engine",
+		Usage:    "Backing database implementation to use ('leveldb' or 'pebble')",
+		Value:    "leveldb",
+		Category: flags.EthCategory,
+	}
 	AncientFlag = &flags.DirectoryFlag{
 		Name:     "datadir.ancient",
 		Usage:    "Root directory for ancient data (default = inside chaindata)",
@@ -1009,6 +1015,12 @@ var (
 	}
 )
 
+func init() {
+	if rawdb.PebbleEnabled {
+		DatabasePathFlags = append(DatabasePathFlags, DBEngineFlag)
+	}
+}
+
 // MakeDataDir retrieves the currently requested data directory, terminating
 // if none (or the empty string) is specified. If the node is starting a testnet,
 // then a subdirectory of the specified datadir will be used.
@@ -1484,6 +1496,14 @@ func SetNodeConfig(ctx *cli.Context, cfg *node.Config) {
 	if ctx.IsSet(InsecureUnlockAllowedFlag.Name) {
 		cfg.InsecureUnlockAllowed = ctx.Bool(InsecureUnlockAllowedFlag.Name)
 	}
+	if ctx.IsSet(DBEngineFlag.Name) {
+		dbEngine := ctx.String(DBEngineFlag.Name)
+		if dbEngine != "leveldb" && dbEngine != "pebble" {
+			Fatalf("Invalid choice for db.engine '%s', allowed 'leveldb' or 'pebble'", dbEngine)
+		}
+		log.Info(fmt.Sprintf("Using %s as db engine", dbEngine))
+		cfg.DBEngine = dbEngine
+	}
 }
 
 func setSmartCard(ctx *cli.Context, cfg *node.Config) {